Improved blast-heating- tttrnace



iuitd gti/rtw para aan.

Lema Patent No. 92,526, daad July 13, V1869.-

IMPROVED BLAST-HEATING- YFU'IEQJNACE.

The Schedule referred to in these Letters Patent and making-part or the same.

a full, clear, and exact description thereof, which will enable others skilled in the ait to make and use the same, `reference being had to the accompanying drawings,` forming part vof this speciication, in which- Figure 1 represents a front elevation, partly in sec- .tion of my. improved blast-heater.

Figure 2 is a vertical transverse section of the same.

Similar'letters of reference indicateconesponding parts.

This invention has for its object to construct a simple and eifective device for heating the air that is carried to a blast-furnace and consists 'm such an arrangement of pipes that the air will be, in thin sheets, exposed to heated surfaces, and that expansion and contraction of the pipes will not injure the apparatus. The'device will therefore operate successfully, andwill not readily get out of order. l l

H, in the drawing, represents a horizontal pipe or vessel, of suitable length, divided by means of a horizontal or inclined partition, E, into` two chambers, A and B, of which the lower one, B, is open at one end, at a, and the upper one at the opposite end, at b, as indicated in fig-1.

D D are collars, projecting from the top of the pipe H, at suitable distances apart, for the purpose of sup'- portingthe outer pipes G, which are closed at their upper ends, as shown.

rllhe partition E is also peribrated under each pipe G, and from it projects a small tube, C, into each one of the pipes YG ras shown, each tube G being open at both ends, andnot reaching quite to the upper end of the surrounding pipe Gr.

An annular channel, 1, is thus arranged within each pipe G, and around each tube C.

The upper parts of the pipes Gr are enlarged and rounded, as shown, and depressed in the centre,'for the purpose of facilitating the passageof air from .the

surfaces of the pipes G.

tubes C to the annular passage d, and to avoid fric-v tion.

The burning gases surround the pipes G and H,"and heat their. sulfaces.

The air is forced .into the lower compartment B, at a, and passes up in the tubes C; thence into the passage d, where it is, in thin sheets, exposed to the heated It leaves the passages cl at their lower ends, and enters the upper compartment A of the pipe H, whence it escapes through the opening b,either into a blast-lmace or into another heating-apparatus of similar construction.

It must be understood that for an ordinary large blast-flunace, a series of eight or ten pipes, H, with uprights G, should beprcvided, in order to produce sufficient heating-surface.

The pipes all support themselves, and do notstrain any supporting-frame or other machinery. They can therefore be heated to a greaterdegrec than the other devices heretofore used.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent- 1. The air-heating apparatus, consisting of the di-V vided base-pipe H, and of the upright pipes C and G, all arranged in such manner that the air will pass fron'i one compartment of the base-pipe, tluough all the vertical pipes, into the other compartment of the `basepipe, substantially as herein shown and described.

2. Forming the rounded enlargement on the upper end of each pipe G, to prevent `friction of the air, as specified.

3. So constructing an air-heating apparatus that the air is, in a thin sheet, exposed tothe heated siuface oi' apipe, as specified, the said air surrounding the pipe or tube'iu which it was conducted to the upper end oi the heated pipe, as set forth.

.HOMER l'iAllTl'UlON.

Witnesses Mormrs ULLMAN, OWEN Jlwnns. 

